Jim Mann vs. Roy Thomas — Career Comparison

On the career pitching numbers, Roy Thomas posted a stronger line than Jim Mann. Roy Thomas posted stronger numbers in ERA (3.82 vs 4.83) and home runs allowed (0.71 per nine innings vs 1.42). By the career numbers, Roy Thomas had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.